/*
* The Java Conflation Suite (JCS) is a library of Java classes that
* can be used to build automated or semi-automated conflation solutions.
*
* Copyright (C) 2003 Vivid Solutions
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.vividsolutions.jcs.conflate.polygonmatch;
import com.vividsolutions.jump.feature.Feature;
import com.vividsolutions.jump.feature.FeatureCollection;
/**
* Re-scales the scores output from another FeatureMatcher
*/
public class ScaleScoresMatcher implements FeatureMatcher {
/**
* Creates a ScaleScoresMatcher without setting newZeroScore nor newFullScore.
* Be sure to set them.
*/
public ScaleScoresMatcher() {
}
/**
* Creates a ScaleScoresMatcher with the given control points.
* @param newZeroScore the score that will be warped to 0
* @param newFullScore the score that will be warped to 1
*/
public ScaleScoresMatcher(double newZeroScore, double newFullScore) {
setNewZeroScore(newZeroScore);
setNewFullScore(newFullScore);
}
/**
* Sets one of the control points.
* @param newZeroScore the score that will be warped to 0
*/
public void setNewZeroScore(double newZeroScore) {
this.newZeroScore = newZeroScore;
}
private double newZeroScore = 0;
private double newFullScore = 1;
/**
* Sets one of the control points.
* @param newFullScore the score that will be warped to 1
*/
public void setNewFullScore(double newFullScore) {
this.newFullScore = newFullScore;
}
/**
* Scales the scores so that #newZeroScore becomes 0 and #newFullScore
* becomes 1. Scores outside of 0 and 1 get set to 0 and 1 respectively.
* @param target ignored
* @param candidates a Matches object created by another FeatureMatcher
* @return the scaled scores
*/
@Override
public Matches match(Feature target, FeatureCollection candidates) {
Matches oldMatches = (Matches) candidates;
Matches newMatches = new Matches(candidates.getFeatureSchema());
for (int i = 0; i < oldMatches.size(); i++) {
newMatches.add(oldMatches.getFeature(i), convert(oldMatches.getScore(i)));
}
return newMatches;
}
private double convert(double oldScore) {
//y = m x + b; v = m u + b
double x = newZeroScore, y = 0, u = newFullScore, v = 1;
double m = (y - v) / (x - u);
double b = y - (m * x);
return Math.min(1, Math.max(0, (m * oldScore) + b));
}
}